SRP's six-reservoir system, which includes Saguaro Lake, reached 55% capacity in late April 2026, down from 68% a year earlier and the lowest late-April level since 2018. SRP hydrologist Jake Richardson said the system holds roughly 1.5 years of supply with no new inflow.
Salt River · Salt River Project
Saguaro Lake
Stewart Mountain Dam · 69,765 AF capacity at full pool
Loading live data
Loading map…
About Saguaro
Saguaro Lake sits behind Stewart Mountain Dam on the Salt River, the most downstream of the four Salt River Project reservoirs along the Salt. Its outflow enters the lower Salt River corridor and the SRP canal system.
Stewart Mountain Dam was completed in 1930 and is operated by the Salt River Project. Saguaro is the smallest of the four Salt River reservoirs by maximum storage.
Daily storage and elevation values come from SRP's Daily Water Report. AZMap presents a percent-of-capacity readout.
Recent coverage
Coverage from federal agencies and named news outlets. AZMap is not the publisher.
- Can SRP meet Valley's water demand with reservoirs almost half empty?
- SRP water reserves under pressure after driest winter on record
SRP reported its reservoir system at 54% capacity in mid-January 2026, down from 70-75% a year prior, after the driest winter on record and a weak 2025 monsoon. SRP plans to reassess in May and may increase groundwater pumping if spring runoff stays low.
